import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.SocketException;
import java.nio.charset.StandardCharsets;

/**
 * Created with IntelliJ IDEA.
 * Description:
 * User: 86183
 * Date: 2024-04-25
 * Time: 8:41
 */
public class UdpEchoServe {
    DatagramSocket socket = null;
    public UdpEchoServe(int port) throws SocketException {
        socket = new DatagramSocket(port);
    }
    public void start() throws IOException {
        System.out.println("服务器启动!");
        while(true){
            DatagramPacket requestPacket = new DatagramPacket(new byte[4096],4096);
            socket.receive(requestPacket);
            String request  = new String(requestPacket.getData(),0,requestPacket.getLength());
            String response = process(request);
            DatagramPacket responsePacket = new DatagramPacket(response.getBytes(),0,
                    response.getBytes().length,requestPacket.getSocketAddress());
           socket.send(requestPacket);
            System.out.printf("[%s,%d], request=%s , response = %s\n",requestPacket.getAddress(),requestPacket.getPort(),request,response);
        }

    }
    public String process(String  request){
        return  request;
    }
    public static void main(String[] args) throws IOException {
        UdpEchoServe udpEchoServe = new UdpEchoServe(9090);
        udpEchoServe.start();

    }
}
